ANSI/ASME/ASTM Inch

Countersunk External Tooth-Lock Washers - Type A

Standard ASME B18.21.1-1999
Description Countersunk External Tooth-Lock Washer, ASME B18.21.1, No. 16 in., Type A
Part number ASME B18.21.1 - CETLW-A - NS No. 16
Product selection
Selector Nominal Washer Size Nominal Washer Size (inch) A Max. - Inside Diameter (inch) A Min. - Inside Diameter (inch) B Reference - Outside Diameter (inch) C Max. - Thickness (inch) C Min. - Thickness (inch) D Max. - Length (inch) D Min. - Length (inch)
1 No. 4 0.112 0.123 0.113 0.213 0.019 0.015 0.065 0.05
2 No. 6 0.138 0.15 0.14 0.289 0.021 0.017 0.092 0.082
3 No. 8 0.164 0.177 0.167 0.322 0.021 0.017 0.099 0.083
4 No. 10 0.19 0.205 0.195 0.354 0.025 0.02 0.105 0.088
5 No. 12 0.216 0.231 0.22 0.421 0.025 0.02 0.128 0.118
6 1/4 0.25 0.267 0.255 0.454 0.025 0.02 0.128 0.113
11 No. 16 0.268 0.287 0.273 0.505 0.028 0.023 0.147 0.137
7 5/16 0.3125 0.333 0.318 0.599 0.028 0.023 0.192 0.165
8 3/8 0.375 0.398 0.383 0.765 0.034 0.028 0.255 0.242
9 7/16 0.4375 0.463 0.448 0.867 0.045 0.037 0.27 0.26
10 1/2 0.5 0.529 0.512 0.976 0.045 0.037 0.304 0.294
Nominal Washer Size
Nominal Washer Size (inch)
A Max. - Inside Diameter (inch)
A Min. - Inside Diameter (inch)
B Reference - Outside Diameter (inch)
C Max. - Thickness (inch)
C Min. - Thickness (inch)
D Max. - Length (inch)
D Min. - Length (inch)